Active material for battery-plates



UNITED STATES WILLIAM GARDINER AND WILLIAM H. DUGGAN, 01 CHICAGO,ILLINOIS.

ACTIVE MATERIAL FOR BATTERY-PLATES.

1,342,953. Re l lrawing.

- To'all whom it may concern:

v Be it known that we, WILLIAM GARDINER and W ILLIAM H. DUGGAN, citizensof the United States of America, and residents of -Chicago, Cook county,Illinois, have invent Our invention relates to an improvement in activematerial fol-battery plates, and has for its object the provision of amaterial which will produce a more efficient stora e battery and whichwill permit the rea y escape of gases, thereby eliminating the danger.of buckling the plates holding the material. a

These and other features and objects of our invention will be morereadily understood by the following description of the manner in whichthe material is made.

.L- In order to form the positive plate, we first take a mixture ofequal parts of oxid of lead and pure lead, and to two parts of i -t leadmixture add one part of kieselguhr by volume. To this is then added asmall quantity of powdered pumice. stone in the proportion of about onepart to 100 of the above mixture, and also a small quantity of sulfateof ammonia, preferably in or stal form, in the proportion of one part ofsu fate of ammonia to 400' pounds of the lead mixture.- The whole isthen mixed with sulfuric acid of about 1.100 test, specific gravity,

40 material together and also to bind it to the tom of sufficient acidbeing added to form a thick paste which is then put into the batteryplates and deft todry in the usual manner. In this compound thekieselguhr or mfusorial earth is a light fiufi'y compound which is notefiected-by acid or heat and which operates to thoroughly bind theactive grid, thus preventing the same from becomiiig loosened and'iallindown in the botthe battery cell tiring-the charging Specification 61Letters Patent.

Patented June 8, .1920.-

Application-filed August.- 23, 1919. Serial Ito. 319,522.

i and discharging of the battery. The powthus preventing the mixturefrom swelling which eliminates any danger of the plates buckling. i

In order to form the negative plate to work with the above positiveplate, we first mix equal parts of the oxid of lead and pure lead towhich is added a small. qua ti ty of carbon, about one part of carboneing added to each two hundred parts of the lead mixture. This is thenadded to av small quantity of mercury, about one part to three hundredparts of lead mixture, the whole then being mixed with a solution ofsulfuric acid about 1,100 specific gravity, until a thick paste isformed. This paste is then put in the plates and left to dry in theusual manner. In this mixture, the carbon operates to increase theefiiciency of the mixture by rendering the same a better conductorwhilethe mercury operates to amalgamate the negative plate.

\Vhile we have illustrated and described specific embodiments of ourinvention, it will be understood that we do not wish to be limited tothe exact proportions and mixtures described, but that variousmodifications can be made without departing from the spirit of ourinvention.

Ehat we clalm as our invention is An active material for storagebatteries consisting of a mixture containing oxid of lead, kieselguhr,powdered pumice stone WILLIAM GARDINER. -WILLIAM H. DUGGAN.

